US3775983A - Movable gate system for a hydraulic dam - Google Patents

Movable gate system for a hydraulic dam Download PDF

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Publication number
US3775983A
US3775983A US00277111A US3775983DA US3775983A US 3775983 A US3775983 A US 3775983A US 00277111 A US00277111 A US 00277111A US 3775983D A US3775983D A US 3775983DA US 3775983 A US3775983 A US 3775983A
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shutter
jack
rod
dam
abutment member
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US00277111A
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J Aubert
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B7/00—Barrages or weirs; Layout, construction, methods of, or devices for, making same
    • E02B7/20—Movable barrages; Lock or dry-dock gates
    • E02B7/40—Swinging or turning gates
    • E02B7/44—Hinged-leaf gates

Definitions

  • a device for operating at least one shutter of a movable dam comprises an oscillating guide pivoted on a horizontal pin which is attached to the body or floor of the dam, a push-rod capable of translational motion with respect to the oscillating guide and an abutment member which is orientable about a horizontal shaft attached to the shutter, the abutment member being adapted to receive the extremity of the push-rod which is applied against the abutment member during operation of the shutter.
  • MOVABLE GATE SYSTEM FOR A HYDRAULIC DAM This invention relates to a movable gate system for a hydraulic dam.
  • a dam consists of a mass of masonry which is anchored in the" ground and constitutes the body of the darn when this latter has a massive structure of the floor of the dam when it is constructed in the form of a slab or plate.
  • the floor is placed between twoabutments and in some structures is divided into sections by piers, provision being made for movable elements disposed between the piers and constituting the so-called gate.
  • the massive body of a dam can also be surmounted by a movable gate.
  • Some gate systems which are already known consist of juxtaposed elements of small size which can be displaced independently of each other. These elements can take up a practically vertical end position, a second and substantially horizontal end position and in many instances can also take up intermediate positions.
  • Movable gate elements of this type can be constituted by a wicket or shutter panel which is pivotally attached to the floor or the body of the dam and maintained in the different positions mentioned above by means of a prop supported on stop catches which are secured to the floor or to the body of the darn.
  • the movable gate elements comprise a tie-frame or horse which is pivoted to the floor or to the body of the dam and a shutter panel which is in turn pivoted about a horizontal hinge-pin attached to the horse. In that case, the prop is pivoted to the horse.
  • the movable shutter elemerits-of the type specified in the foregoing will be designated by the word shutter," this term being intended to refer not only to the shutter panel but also to the other movable components which are associated there with.
  • Theterm applies both to the shutter panel which is pivoted directly to the floor and to the panel which is pivoted to a hinged horse, or to other juxtaposed and differently arranged elements having small dimensions.
  • This type of gate which is constituted by small juxtaposed elements, has an advantage in that the piers or abutments can be spaced at a substantial distance from each other, thus forming wide navigable channels when the dam is open.
  • the primary aim of the invention is to overcome the disadvantages mentioned above by providing a shutteroperating means of rugged design which is low in construction cost and does not mar the appearance of. the landscape since the superstructure is completely eliminated.
  • the movable gate system for a hydraulic darn which comprises at least one shutter and one device for operating said shutter, is distinguished by the fact that the operating device comprisesan oscillating guide rotatably mounted with respect to a horizontal pin attached to the floor or to I the body of the dam, a push-rod movable in rectilineal translational motion with respect to said guide, means for displacing the push-rod with respect to the guide and an abutment member which is orientable about a horizontal shaft attached to the shutter, said abutment member beingadapted to receive the extremity of said push-rod which is applied against said member during an operation of said shutter.
  • the oscillating guide and the movable push-rod are constituted respectively by the body and the rod of a main oil-actuated jack and the operating rod of the jack is withdrawn between two operations into the interior of the jack body in which said rod is immersed in the oil.
  • the operating rod is thus protected against the action of the water except during the operations of the shutter which are of short duration. Said action of the water would be liable to result in oxidation of the jackoperating rodif the water were acid and in erosion if the water contained substances in suspension.
  • the body of the main jack is mounted within a cavity formed in the body or the floor of the dam and said cavity isprotected by a hood provid-ed with only a narrow slot for permitting the jack-operating rod to pass therethrough. Said slot is in turn closed between two operations by means of an articulated cover.
  • the jack is surrounded by practically motionless water andthere is noreason to fear any substantial muddeposits inside the cavity within which the jack is housed and in which this latter must be capable of undergoing a change of orientation;
  • the system comprises a device for locking the main jack body in position between two operations.
  • This device is controlled in dependence on the supply of oil under high pressure to the jack, with the result that the locking action is suppressed automatically at the beginning of each operation.
  • the system preferably comprises in addition a device for locking the abutment member of the shutter.
  • the jack body on the one hand and the abutment member of the shutter on the other hand accordingly retain the position which they had occupied at the end of a previous operation.
  • the rod of the jack will therefore be oriented towards the abutment member which will in turn be suitably positioned for receiving said rod.
  • the abutment member is advantageously pivoted to this latter in order to reduce the danger of damage in the event of impact as has been stated earlier.
  • FIG. 1 is a vertical sectional view taken parallel to the direction of flow and showing a movable gate element in accordance with the invention, the shutter being in the raised position
  • FIG. 2 is a view which is similar to FIG. 1 and in which the shutter is shown in the horizontal position of withdrawal
  • FIG. 3 is a plan view with portions broken away and corresponding to FIG. 2
  • FIG. 4 is a view in elevation showing a device for locking the jack body of FIGS. 1 to 3;
  • FIG. 5 is a plan view to a smaller scale and corresponding to FIG. 4
  • FIG. 6 is a transverse sectional view of a device for locking the orientable abutment member of the shutter of FIGS. 1 to 3
  • FIG. 7 is a plan view of the pivotally mounted abutment member of the shutter of FIGS. 1 to 3
  • FIG. 8 is a diagram of the oil supply to the jacks of FIGS.1to3and4to5;
  • FIG. 9 is a vertical sectional view taken parallel to the direction of flow and showing a movable gate element in accordance with the invention, said element being mounted on the spillway crest of a stationary dam.
  • FIGS. 1 to 8 There is shown in FIGS. 1 to 8 a movable gate element in accordance with the invention as applied to a movable dam, the gate of said dam being constituted by the juxtaposed assembly of similar elements.
  • a movable dam is the term customarily employed to designate a darn which is usually built across the bed of a watercourse, in which the assembly consisting of the movable portions constituting the gate 2 system has a large surface area.
  • the stationary portions of these dams are usually constituted by a masonry floor 1 limited by two abutments with piers interposed in some cases between these latter.
  • a sill 2 is anchored to said floor 1 and supports a horizontal shaft 3 on which the shutter 4 is pivotally mounted.
  • said shutter comprises a horse 5 which is pivoted about the stationary shaft 3 and a shutter panel 6 which is in turn pivotally attached to the horse 5 in the vicinity of the mid-point of said panel.
  • the shutter panel 6 has been partially broken away so as to leave only a bottom corner as shown in the plan view of FIG. 3, the lateral edge of said shutter panel being represented schematically by the chain-dotted line 7.
  • the lower portion of the shutter panel 6 is continuously applied against a sheet metal member which constitutes the upstream face of the sill 2.
  • Said sheet metal member 8 is provided with recesses 9 (shown in FIGS. 2 and 3) in order that the horse 5 can be raised.
  • Said horse 5 comprises a rectangular frame strengthened by cross-bracing members (not shown). Aside from the components employed for pivotal attachment to the shaft 3, said frame is adapted to carry two sets of three brackets 11 (as shown in FIG. 3), each set being intended to support a pin 12 on which are pivotally mounted on the one hand the shutter 6 and, on the other hand, a lifting beam 13 in which is fixed the top end of a prop 14. The bottom end of said prop is applied against one of the stop catches 15 of a slide 16 of the type, for example, which is referred-to as a Pascaud hurter.
  • the shutter 4 is capable of assuming a number of positions at different angles of inclination with respect to the horizontal plane, each of these positions being such as to correspond to one of the stop catches 15.
  • the invention provides for a device comprising an oscillating guide 17 which is pivoted about a horizontal pin 18 attached to the floor 1, and a push-rod 19 which is capable of moving in rectilineal translational motion with respect to the oscillating guide 17.
  • the operating device further comprises an abutment member 21, said member being orientable about a horizontal shaft which is attached to the horse 5 and being adapted to receive the extremity of the push-rod 19 which is applied against said member during the operations of the shutter.
  • the oscillating guide 17 is constituted by the body of an oil-actuated main jack and the push-rod 19 is the operating rod of said jack.
  • the body 17 of the main jack is housed in a cavity 22 which is formed within the floor l.
  • the cavity 22 is provided at the surface of the floor with a substantially rectangular opening 23 having a dimension in the direction at right angles to the axis of the jack which is only slightly greater than the diameter of the jack body so that this latter is accordingly permitted to oscillate about the pin 18 with provision for a small clearance with respect t the lateral walls of the cavity 22.
  • the opening 23 is surmounted by a shield hood 24, a narrow slot 25 through which the operating rod 19 of the main jack is permitted to pass being formed in the upstream wall of said hood which is directed towards the shutter 4.
  • Said slot 25 can in turn be closed by a cover 26 which is hinged about a horizontal pin 20.
  • the operating rod 19 of the main jack is connected to a piston which is movable within the body 17 and divides this latter into two chambers. Each chamber is connected by means of a system which will be described hereinafter to two ducts 27 and 28.
  • the two chambers of the body 17 are continuously kept full of oil and the body 17 is so designed as to be capable of containing the full length of the operating rod 19 when this latter is in its withdrawn position (as shown in FIG. 2).
  • the abutment member 21 is constituted (see FIG. 7) by a shaped or sectional shaft which is provided at both ends with cylindrical shaft-journals 31 mounted injournal-bearings provided on the side-stringers of the horse 5. There is formed in the central portion of the abut- Y ment-member or shaft 21 a cavity 32 of substantially frusto-conical shape which is adapted to accommodate the extrem'ity of the operating rod 19 of the main jack.
  • the shaft 21 is so dimensioned that its center of gravity 1 islocated in the vicinity of its geometrical axis of rota- .sake of enhanced clarity but are shown in FIGS. 4 to 6.
  • the jack body 17 is provided with two trunnions 33,
  • trunnion-bearings 35 which are secured to the floor 1.
  • the trunnion 34 has'an extension beyond the corresponding bearing so as to form a cylindrical portion 36 having a roughened surface.
  • the common geometrical axis of the trunnions 33 and 34 corresponds to the pin 18 of FIGS. 1 and 2.
  • An elbowed lever 38 pivoted about a horizontal pin 39 which is attached to the floor comprises a first arm 41 and a second arm 42 having a roughened portion which is adapted to bear on the rough surface of the cylinder 36. Saidlever is particularly visible in FIG. 4 which has been drawn to a larger scale than FIG. 5.
  • the first arm of the lever 38 is subjectedto the action of bearing means which, in the embodiment shown, are constituted by a gravity block 43 whichis pivotally attached near the extremity of the arm 41.
  • the device further comprises an oil-actuated auxiliary jack 44, the two compartments of which are supplied in parallel with those of the main jack. Said auxiliary jack is placed vertically beneath the gravity block 43 and the operating rod 45 of said jack is directed substantially vertically.
  • the block 43 is provided with a cavity 46 having v a bottom opening and directed towards the operating rod 45 of the auxiliary jack.
  • the device for locking the pivotal abutment member 21 inposition comprises (as shown in FIG. 6) a member 47 which is secured to one side-stringer of the frame of the horse 5.
  • Said member 47 has a face 48 of substantially cylindrical shape which is coaxial with a journal 31 of the shaft 21 and disposed in the vicinity of the periphery of said journal.
  • Said face 48 is provided with recesses 49 in the shape of spherical cups and equal in number to the intended positions of the shutter 4. So far as concerns the shaft-journal 31, this latter is provided with a cavity 51 having an opening which is directed towards the member 47, there being housed within said cavity a ball 52 which is thrust back by a spring 53.
  • both the lower chambers and the upper chambers of the two jacks are at the same pres sure at each instant.
  • the pipes 63, 64 extend to an electrovalve 69 of a type which is known per se and which does not therefore need to be described in detaiLalthough it would also be possible to adopt another type of valve such as a hydrovalve, for example.
  • the electrovalve 69 is also connected to the general supply ducts 27, 28 (shown also in FIGS. 1 and 2).
  • the electrovalve 69 comprises a slide-valve 71 pierced by two ducts 72, 73.
  • the slide-valve 71 isactuated by an electromagnet 74 and can assume two positions. In the first position which is shown in FIG. 8, the pipes 63, 64 are connected to the general supply ducts 27, 28. In the second position of the slide-valve 71, the pipes 63, 64 are isolated from the general supply ducts.
  • the movable gate system is fitted in the majority of cases with a large number of juxtaposed shutters such as the shutter 4 which areeach associated with a main jack and an auxiliary jack.
  • Each shutter is intended to be associated with an electrovalve 69 which serves either to connect the shutter to the general supply ducts 27, 28 or to isolate said shutter from these latter.
  • the general supply ducts 27, 28 extend to a central control station (not shown) which; comprises an oil reservoir or storage tank at atmospheric pressure and a' compressor whose input'is connected to said tank.
  • the control station further comprises a reversing valve which is adapted to connect thedluct 27 to the delivery side of the compressor and to connect the duct 28 to the storage tank or conversely.
  • the control station can also comprise a position repeater (not shown) for each main jack, said repeater being branched off the pipe 63 which is connected to the upper chamber 61 of the main jack and being intended to measure the volume of oil discharged from said chamber when the corresponding shutter is operated, thus providing a means for remotely checking the position of said shutter.
  • the general supply ducts 27 and 28 can be dispensed with and the separatepipes 63, 64 which are associated with each main jack can be extended to the control station so as to terminate in a separate reversing valve which connects them respectively either to the compressor or to the storage tank.
  • the system operates as follows When the shutter 4 is in a predetermined position such as, for example, the horizontal position of withdrawal shown in FIG. 2, the operating rod 19 of the main jack is fully retracted within the body 17, both chambers of which are filled with oil at atmospheric pressure. The cover 26 of the hood 24 is closed. The operating rod 45 of the auxiliary jack 44 is also retracted and the gravity block 43 applies the roughened arm 42 of the lever 38 against the roughened cylinder 36, thus locking the body 17 of the main jack in the position which it had occupied at the end of the preceding operation. This positional locking; results from a virtual seizing action of a temporary nature and any risk of displacement is removed.
  • the ball 52 (shown in FIG. 6) is engaged in the particular recess 49 which corresponds to the position ofthe shutter 4 at that time and thus locks the abutment member 21 in the position which it had occupied at the end of the previous operation.
  • the abutment member 21 itself does not display any tendency to change position by reason of the fact that its center of gravity is very close to its geometrical axis of rotation.
  • Positional locking by means of the ball 52 is provided only as; a means of guarding against the effect of vibrations produced by the flow of water.
  • the corresponding electromagnet 74 is supplied from the control station in order that the electrovalve 69 should establish a communication between the separate pipes 63, 64 and the general supply ducts 27, 28 the duct 28 is connected to the delivery side of the compressor and the duct 27 is connected to the storage tank.
  • the lower chambers 62 and 65 of the two jacks are thus supplied with oil and the operating rod of the main jack passes out of the jack body and lifts the cover 26, whereupon the extremity of said operating rod then engages within the'abutment member 21 which is carried by the horse 5.
  • the pressure within the compartment 62 and within said duct 28 remains at a high value until the precise moment when the operating rod of the jack no longer supports the shutter, either because the prop is applied
  • the operating rod of the piston must then be caused to withdraw.
  • the position of the reversing valve of the control station is changed so as to connect the duct 28 to the storage tank and to connect the duct 27 to the delivery side of the compressor this accordingly produces within the upper chambers 61 and 62 of the two jacks a pressure which. is slightly higher than atmospheric pressure so as to cause the withdrawal of the operating rods of both jacks into their respective bodres.
  • the cover 26 of the hood 24 is again closed and the supply of current to the electromagnet 74 is cut off in order that the electrovalve should isolate the two jacks of the general supply ducts 27, 28.
  • the two chambers of the two jacks remain filled with oil at a pressure which is practically equal to atmospheric pressure.
  • the upstream plating of the shutter panel 81 is shaped in such a manner that, in the withdrawn position of the shutter, continuity of the profile of the spillway crest is maintained.
  • a cavity 82 is formed within the crest in order to house the hurter 16 and said cavity has an opening 83 in the downstream face of the crest in order to permit the flow of water.
  • the cavity 22 in which the main jack body 17 is housed has an extension in the form of a passageway 84 which has an opening on the downstream face at 85.
  • the shield hood 24 of the previous embodiment is no longer necessary since the cavity 22 is either protected by the shutter panel 81 when this latter is downwardly withdrawn or in the dry when the shutter is raised, seepage of water through the gate being permitted to pass through the passageway 84.
  • the passageway just mentioned has the effect of removing any potential danger of deposition of silt within the cavity.
  • the installation cost of the system is low in comparison with the cost of erection of a service bridge and operating carriage.
  • Management and control of the gate system is made more flexible and less costly since a complete series of shutters can be remote-controlled within a very short time by a single operator, the speed of operations being limited only by the power of the compressor.
  • the system is further distinguished by a very high degree of reliability.
  • the jacks and electrovalves or hydrovalves are rugged units which have stood the test of time and experience.
  • the operating rod of the main jack is exposed to the water only during the very brief period of operations and is immersed in oil for the rest of the time.
  • the body of the main jack is housed in a closed cavity and its movements are not liable to be hindered by any depositionsof mud andsilt which can take place only at a very slow rate. If so required, it wouldin any case be an easy matter to remove these deposits periodically by suction.
  • the positions of the shutters can readily be indicated from a distance. Between operations, the two chambers of the two jacks are practically at atmospheric pressure, thereby reducing the fatigue of components and virtually removing any danger of oil leakage.
  • the invention is not limited to the embodiments which have just been described and any number of alternative forms of execution can accordingly be contemplated without thereby departing from thescope of the invention.
  • the invention is also applicable to shutters of the type com prising a shutter panel which is pivoted directly on the sill without interposition of a horse.
  • the orientable abutment member is carried by the shutter panel.
  • the operations to be performed are sufficiently sim- .ple to permit of sequential control by means of a servomotor without any human agency. Variations in the level of water upstream of the shutters could, for example, be recorded by means of a float which would initiate in a predetermined order the necessary number of opening or closure operations for maintaining the up stream level between two permanently established limits.
  • Known servomotor systems which are suitable for this purpose are too numerous to call for a preferential description of any one system.
  • a movable gate system for a hydraulic dam said system being such as to comprise at least one shutter rotatably mounted with respect to a horizontal shaft attached to the floor or to the body of the dam, and a device for operating said shutter, wherein said operating device comprises an oscillating guide rotatably mounted with respect to a horizontal pin attached to the floor or to the body of the dam, a push-rod movable in rectilineal translational motion with respect to said guide, means for displacing the push-rod with respect to the guide and an abutment member which is orientable about a horizontal shaft attached to the shutter, said abutment member being adapted to receive the extremity of said push rod which is applied against said member during an operation of said shutter.
  • oscillating guide and the movable push-rod are constituted respectively by the body and the piston rod of a main oil-actuated jack.
  • hood is provided with a hinged cover so as to close the slot through which the operating rod of the main jack is permitted to pass.
  • a system according to claim 2, wherein said system comprises a device for locking the body of the main jack and means operated in dependence on the supply of oil to said jack for controlling said locking device.
  • the locking device comprises an elbowed lever hinged about a horizontal pin, means adapted to produce action on the first arm of said lever in order to apply the second arm of the lever against a trunnion which is integral with the body of the main jack and an auxiliary oil-actuated jack which is supplied in parallel with the main jack and the operating rod of which controls the application means aforementioned so as to discontinue application of the second arm of said lever against said trunnion when the main jack is supplied at high pressure in order to displace the shutter.
  • leverapplication means comprises a gravity block which is pivotally attached near the extremity of the first arm of said lever and has a cavity adapted to accommodate and support the operating rod of the auxiliary jack.
  • a system according to claim 1, wherein the shutter comprises a horse rotatably mounted with respect to a horizontal shaft attached to the floor or to the body of the dam and a shutter panel pivoted about a horizontal shaft attached to said horse, wherein the abutment member is capable of moving about a horizontal shaft attached to said horse.

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  • Structural Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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US00277111A 1971-08-05 1972-08-01 Movable gate system for a hydraulic dam Expired - Lifetime US3775983A (en)

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FR7128734A FR2148836A5 (pt) 1971-08-05 1971-08-05

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IT (1) IT965967B (pt)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352592A (en) * 1979-06-12 1982-10-05 Aubert J Gate system for a hydraulic dam
US4881848A (en) * 1988-07-26 1989-11-21 Davy Mckee Corporation Method of forming an immersed dam foundation and a dam structure thereon
US5178490A (en) * 1992-07-02 1993-01-12 The United States Of America As Represented By The Secretary Of The Army Wicket dam lifting module
US5222834A (en) * 1992-07-02 1993-06-29 The United States Of America As Represented By The U.S. Army Corps Of Engineers Collapsible safety prop for waterway dams
US5310284A (en) * 1992-07-02 1994-05-10 The United States Of America As Represented By The Secretary Of The Army Weak link prop for wicket dam
US5433555A (en) * 1994-02-22 1995-07-18 Nancy Brac De La Perriere Wicket dam and lifting jack
US6132140A (en) * 1995-08-11 2000-10-17 Kullberg; Sten Method for the fabrication of a dam or barrier
WO2001071099A3 (en) * 2000-03-18 2002-02-14 Cornelis Elizabeth Rijlaarsdam Water-retaining structure
US20060078388A1 (en) * 2004-10-06 2006-04-13 Obermeyer Henry K Water control structure
US20160010298A1 (en) * 2013-03-15 2016-01-14 Floodbreak, Llc Flood Guard Barrier Lifting System
US20170292238A1 (en) * 2014-11-28 2017-10-12 Hitachi Zosen Corporation Floating flap gate
US20190242085A1 (en) * 2018-02-08 2019-08-08 Xiaojun Liu Water conserving gate

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1188785B (it) * 1979-04-05 1988-01-28 Pirelli Furlanis Dispositivo per abbassare e sollevare dighe collassibili
FR2570728B1 (fr) * 1984-09-21 1987-01-09 Aubert J Montage de verin oscillant pour clapets de barrage
FR2630471B1 (fr) * 1988-04-25 1990-08-24 Neyrpic Joint destine a l'etancheite laterale d'un clapet de barrage
DE19919290B4 (de) * 1999-04-28 2008-03-20 Brombach, Hansjörg, Prof. Dr.-Ing. habil Klappenwehr

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DE207220C (pt) *
US419287A (en) * 1890-01-14 Lock-gate and dam
DE949875C (de) * 1953-02-18 1956-09-27 Arno Fischer Beweglicher Wehraufsatz mit durch Schraegstreben abgestuetzten Stauklappen, insbesondere fuer Unterwasserkraftwerke
US3107722A (en) * 1960-10-04 1963-10-22 Von Tell Trading Co Ab Hatch covers having hydraulic means for moving the sections
US3338057A (en) * 1965-01-08 1967-08-29 Jack O Eckstine Automatic irrigation gate
DE1459403A1 (de) * 1962-09-15 1969-03-06 Dingler Werke Ag Sektorwehr
US3509724A (en) * 1966-11-14 1970-05-05 Fluid Dynamics Ltd Gate valve means for controlling the flow of water over a weir,dam wall or the like

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
DE207220C (pt) *
US419287A (en) * 1890-01-14 Lock-gate and dam
DE949875C (de) * 1953-02-18 1956-09-27 Arno Fischer Beweglicher Wehraufsatz mit durch Schraegstreben abgestuetzten Stauklappen, insbesondere fuer Unterwasserkraftwerke
US3107722A (en) * 1960-10-04 1963-10-22 Von Tell Trading Co Ab Hatch covers having hydraulic means for moving the sections
DE1459403A1 (de) * 1962-09-15 1969-03-06 Dingler Werke Ag Sektorwehr
US3338057A (en) * 1965-01-08 1967-08-29 Jack O Eckstine Automatic irrigation gate
US3509724A (en) * 1966-11-14 1970-05-05 Fluid Dynamics Ltd Gate valve means for controlling the flow of water over a weir,dam wall or the like

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4352592A (en) * 1979-06-12 1982-10-05 Aubert J Gate system for a hydraulic dam
US4881848A (en) * 1988-07-26 1989-11-21 Davy Mckee Corporation Method of forming an immersed dam foundation and a dam structure thereon
US5178490A (en) * 1992-07-02 1993-01-12 The United States Of America As Represented By The Secretary Of The Army Wicket dam lifting module
US5222834A (en) * 1992-07-02 1993-06-29 The United States Of America As Represented By The U.S. Army Corps Of Engineers Collapsible safety prop for waterway dams
US5310284A (en) * 1992-07-02 1994-05-10 The United States Of America As Represented By The Secretary Of The Army Weak link prop for wicket dam
US5433555A (en) * 1994-02-22 1995-07-18 Nancy Brac De La Perriere Wicket dam and lifting jack
US6132140A (en) * 1995-08-11 2000-10-17 Kullberg; Sten Method for the fabrication of a dam or barrier
US20050100411A1 (en) * 2000-03-18 2005-05-12 Rijlaarsdam Cornelis E. Water-retaining structure
WO2001071099A3 (en) * 2000-03-18 2002-02-14 Cornelis Elizabeth Rijlaarsdam Water-retaining structure
US7033112B2 (en) 2000-03-18 2006-04-25 Cornelis Elizabeth Rijlaarsdam Water-retaining structure
US20060078388A1 (en) * 2004-10-06 2006-04-13 Obermeyer Henry K Water control structure
US7422392B2 (en) 2004-10-06 2008-09-09 Obermeyer Henry K Water control structure
US20160010298A1 (en) * 2013-03-15 2016-01-14 Floodbreak, Llc Flood Guard Barrier Lifting System
US9458588B2 (en) * 2013-03-15 2016-10-04 Floodbreak, Llc Flood guard barrier lifting system
US20170292238A1 (en) * 2014-11-28 2017-10-12 Hitachi Zosen Corporation Floating flap gate
US10458086B2 (en) * 2014-11-28 2019-10-29 Hitachi Zosen Corporation Floating flap gate
US20190242085A1 (en) * 2018-02-08 2019-08-08 Xiaojun Liu Water conserving gate
US10604904B2 (en) * 2018-02-08 2020-03-31 Zhijun Wang Water conserving gate

Also Published As

Publication number Publication date
IT965967B (it) 1974-02-11
BR7205291D0 (pt) 1973-06-12
FR2148836A5 (pt) 1973-03-23

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